Starting mcstransd: 
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.
[....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed!

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   49.100977] kauditd_printk_skb: 4 callbacks suppressed
[   49.100988] audit: type=1400 audit(1546592023.545:35): avc:  denied  { map } for  pid=8060 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
Warning: Permanently added '10.128.15.217' (ECDSA) to the list of known hosts.
executing program
[   55.832535] audit: type=1400 audit(1546592030.275:36): avc:  denied  { map } for  pid=8072 comm="syz-executor402" path="/root/syz-executor402894263" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   55.861707] audit: type=1400 audit(1546592030.305:37): avc:  denied  { map } for  pid=8073 comm="syz-executor402" path="/dev/ashmem" dev="devtmpfs" ino=17341 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=chr_file permissive=1
executing program
[   56.016800] 
[   56.018564] ======================================================
[   56.024860] WARNING: possible circular locking dependency detected
[   56.031157] 4.20.0+ #8 Not tainted
[   56.034670] ------------------------------------------------------
[   56.040962] syz-executor402/8077 is trying to acquire lock:
[   56.046647] 0000000058c0ce88 (&mm->mmap_sem){++++}, at: __do_page_fault+0x9c2/0xd60
[   56.054431] 
[   56.054431] but task is already holding lock:
[   56.060372] 00000000f17664c7 (&sb->s_type->i_mutex_key#12){+.+.}, at: generic_file_write_iter+0xe5/0x6a0
[   56.069975] 
[   56.069975] which lock already depends on the new lock.
[   56.069975] 
[   56.078263] 
[   56.078263] the existing dependency chain (in reverse order) is:
[   56.085857] 
[   56.085857] -> #2 (&sb->s_type->i_mutex_key#12){+.+.}:
[   56.092595]        down_write+0x8a/0x130
[   56.096772]        shmem_fallocate+0x168/0x1200
[   56.101422]        ashmem_shrink_scan+0x239/0x630
[   56.106251]        ashmem_ioctl+0x38a/0x12c0
[   56.110644]        do_vfs_ioctl+0x107b/0x17d0
[   56.115114]        ksys_ioctl+0xab/0xd0
[   56.119068]        __x64_sys_ioctl+0x73/0xb0
[   56.123487]        do_syscall_64+0x1a3/0x800
[   56.127885]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   56.133571] 
[   56.133571] -> #1 (ashmem_mutex){+.+.}:
[   56.139015]        __mutex_lock+0x12f/0x1670
[   56.143404]        mutex_lock_nested+0x16/0x20
[   56.147977]        ashmem_mmap+0x55/0x520
[   56.152103]        mmap_region+0xde5/0x1ca0
[   56.156412]        do_mmap+0xa09/0x1220
[   56.160364]        vm_mmap_pgoff+0x20b/0x2b0
[   56.164747]        ksys_mmap_pgoff+0x4f8/0x650
[   56.169305]        __x64_sys_mmap+0xe9/0x1b0
[   56.173700]        do_syscall_64+0x1a3/0x800
[   56.178086]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   56.183769] 
[   56.183769] -> #0 (&mm->mmap_sem){++++}:
[   56.189302]        lock_acquire+0x1db/0x570
[   56.193629]        down_read+0x8d/0x120
[   56.197584]        __do_page_fault+0x9c2/0xd60
[   56.202143]        do_page_fault+0xe6/0x7d8
[   56.206440]        page_fault+0x1e/0x30
[   56.210397]        iov_iter_fault_in_readable+0x377/0x450
[   56.215916]        generic_perform_write+0x202/0x6b0
[   56.220994]        __generic_file_write_iter+0x25e/0x630
[   56.226429]        generic_file_write_iter+0x34e/0x6a0
[   56.231698]        __vfs_write+0x764/0xb40
[   56.235931]        vfs_write+0x20c/0x580
[   56.239968]        ksys_write+0x105/0x260
[   56.244092]        __x64_sys_write+0x73/0xb0
[   56.248481]        do_syscall_64+0x1a3/0x800
[   56.252955]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   56.258652] 
[   56.258652] other info that might help us debug this:
[   56.258652] 
[   56.266764] Chain exists of:
[   56.266764]   &mm->mmap_sem --> ashmem_mutex --> &sb->s_type->i_mutex_key#12
[   56.266764] 
[   56.278270]  Possible unsafe locking scenario:
[   56.278270] 
[   56.284394]        CPU0                    CPU1
[   56.289044]        ----                    ----
[   56.293704]   lock(&sb->s_type->i_mutex_key#12);
[   56.298447]                                lock(ashmem_mutex);
[   56.304394]                                lock(&sb->s_type->i_mutex_key#12);
[   56.311646]   lock(&mm->mmap_sem);
[   56.315163] 
[   56.315163]  *** DEADLOCK ***
[   56.315163] 
[   56.321195] 2 locks held by syz-executor402/8077:
[   56.326007]  #0: 00000000bd335e9a (sb_writers#6){.+.+}, at: vfs_write+0x429/0x580
[   56.333614]  #1: 00000000f17664c7 (&sb->s_type->i_mutex_key#12){+.+.}, at: generic_file_write_iter+0xe5/0x6a0
[   56.343650] 
[   56.343650] stack backtrace:
[   56.348124] CPU: 0 PID: 8077 Comm: syz-executor402 Not tainted 4.20.0+ #8
[   56.355025] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.364358] Call Trace:
[   56.366927]  dump_stack+0x1db/0x2d0
[   56.370640]  ? dump_stack_print_info.cold+0x20/0x20
[   56.375633]  ? print_stack_trace+0x77/0xb0
[   56.379850]  ? vprintk_func+0x86/0x189
[   56.383719]  print_circular_bug.isra.0.cold+0x1cc/0x28f
[   56.389059]  __lock_acquire+0x3014/0x4a30
[   56.393188]  ? mark_held_locks+0x100/0x100
[   56.397403]  ? shmem_getpage_gfp+0x197e/0x4b70
[   56.401978]  ? trace_hardirqs_off_caller+0x300/0x300
[   56.407058]  ? do_raw_spin_trylock+0x270/0x270
[   56.411622]  ? shmem_getpage_gfp+0x26fb/0x4b70
[   56.416211]  ? __lock_is_held+0xb6/0x140
[   56.420253]  lock_acquire+0x1db/0x570
[   56.424036]  ? __do_page_fault+0x9c2/0xd60
[   56.428255]  ? ___might_sleep+0x1e7/0x310
[   56.432390]  ? lock_release+0xc40/0xc40
[   56.436345]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   56.441339]  ? cmp_ex_search+0x8c/0xb0
[   56.445208]  down_read+0x8d/0x120
[   56.448639]  ? __do_page_fault+0x9c2/0xd60
[   56.452851]  ? __down_interruptible+0x740/0x740
[   56.457496]  ? do_writepages+0x1a0/0x1a0
[   56.461541]  ? set_page_dirty+0x5dd/0xfc0
[   56.465669]  __do_page_fault+0x9c2/0xd60
[   56.469714]  do_page_fault+0xe6/0x7d8
[   56.473497]  ? unlock_page+0x2b1/0x4a0
[   56.477363]  ? vmalloc_sync_all+0x30/0x30
[   56.481488]  ? balance_dirty_pages_ratelimited+0x1b0/0x2370
[   56.487179]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   56.492001]  page_fault+0x1e/0x30
[   56.495437] RIP: 0010:iov_iter_fault_in_readable+0x377/0x450
[   56.501217] Code: 89 f6 41 88 57 e0 e8 f8 d7 f3 fd 45 85 f6 74 c1 e9 70 fe ff ff e8 69 d6 f3 fd 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f 1f 00 41 88 57 d0 31 ff 89 de e8 c5 d7 f3 fd 85 db
[   56.520110] RSP: 0018:ffff88808d34f8a8 EFLAGS: 00010293
[   56.525449] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000020e0123f
[   56.532695] RDX: 0000000000000000 RSI: ffffffff838e1ee7 RDI: 0000000000000007
[   56.539943] RBP: ffff88808d34f948 R08: ffff88809f598640 R09: fffff9400042794f
[   56.547192] R10: fffff9400042794e R11: ffffea000213ca77 R12: 0000000000001000
[   56.554439] R13: 0000000000001000 R14: 0000000000000000 R15: ffff88808d34f920
[   56.561693]  ? iov_iter_fault_in_readable+0x367/0x450
[   56.566870]  ? iov_iter_fault_in_readable+0x367/0x450
[   56.572039]  ? copy_page_from_iter+0x900/0x900
[   56.576602]  ? shmem_write_begin+0x105/0x1e0
[   56.580988]  ? shmem_write_begin+0x10f/0x1e0
[   56.585395]  generic_perform_write+0x202/0x6b0
[   56.589983]  ? add_page_wait_queue+0x480/0x480
[   56.594553]  ? current_time+0x1b0/0x1b0
[   56.598506]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   56.603504]  ? generic_write_check_limits+0x291/0x380
[   56.608672]  __generic_file_write_iter+0x25e/0x630
[   56.613577]  ? __fget+0x499/0x710
[   56.617019]  generic_file_write_iter+0x34e/0x6a0
[   56.621760]  ? __generic_file_write_iter+0x630/0x630
[   56.626964]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   56.632480]  ? iov_iter_init+0xea/0x220
[   56.636433]  __vfs_write+0x764/0xb40
[   56.640129]  ? kernel_read+0x120/0x120
[   56.643999]  ? rcu_read_lock_sched_held+0x110/0x130
[   56.648999]  ? rcu_sync_lockdep_assert+0x73/0xb0
[   56.653733]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   56.659250]  ? __sb_start_write+0x1ac/0x360
[   56.663558]  vfs_write+0x20c/0x580
[   56.667080]  ksys_write+0x105/0x260
[   56.670687]  ? __ia32_sys_read+0xb0/0xb0
[   56.674729]  ? do_futex+0x2910/0x2910
[   56.678509]  ? trace_hardirqs_off_caller+0x300/0x300
[   56.683590]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   56.688324]  __x64_sys_write+0x73/0xb0
[   56.692192]  do_syscall_64+0x1a3/0x800
[   56.696059]  ? syscall_return_slowpath+0x5f0/0x5f0
[   56.700968]  ? prepare_exit_to_usermode+0x232/0x3b0
[   56.705969]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   56.710817]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   56.715982] RIP: 0033:0x446399
[   56.719159] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   56.738037] RSP: 002b:00007fbc64da6da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000001
[   56.745742] RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446399
[   56.752989] RDX: 00000000fffffe48 RSI: 0000000020004240 RDI: 0000000000000004
[   56.760239] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
executing program
[   56.767488] R10: 0000000000000000 R11: 0000000000000297 R12: 00000000006dcc2c
[   56.774734] R13: 656363615f6c6361 R14: 5f7869736f70275b R15: 00000000006dcd2c
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